Technical data
30
Alpha 240XP and 240XE - Component Replacement
8.29 TEMPERATURE SENSORS - Fig. 33
Note that both sensors are the same.
1. Gain access as described in section 8.1.
2. CH Sensor - Disconnect the wiring and unscrew the sensor. Re-assemble in reverse order with a new sensor.
2a. DHW Sensor - Close the mains cold water inlet valve and open the lowest hot water tap to drain the DHW system.
Disconnect the wiring and unscrew the sensor. Re-assemble in reverse order with a new sensor, replacing the sealing
washer if necessary.
8.30 AUTOMATIC AIR VENT - Fig. 33
1. Drain the boiler heating circuit as described in section 8.2.
2. Unscrew the automatic air vent from the pump outlet. Fit a new one using a new 'O' ring.
3. Refill and pressurise the system. (Refer to Commissioning, section 5.1).
8.31 PUMP - Refer to Fig. 33
Drain the boiler heating as described in section 8.2.
Pump Head
1. Remove the four socket head screws securing the pump head to the body. Withdraw the head, remove the wiring cover
and disconnect the wiring.
2. Connect the wiring to the new head as follows:-
Brown to L, Blue to N, Green/yellow to .
Ensure the pump is set to maximum (3) and re-assemble in reverse order.
3. Refill and pressurise the system. (Refer to Commissioning, section 5.1).
Complete pump
1. Unscrew the automatic air vent from the pump outlet.
2. Disconnect the pump unions and withdraw the pump, remove the wiring cover and disconnect the wiring.
3. Connect the wiring as described above, ensure that pump is set to maximum and re-assemble using new sealing washers.
4. Refill and pressurise the system. (Refer to Commissioning, section 5.1).
Automatic
air vent
Pump
CH temperature
sensor
DHW temperature
sensor
8.32 DHW HEAT EXCHANGER - Refer to Fig. 34
1. Drain the boiler heating and hot water circuits as described in section 8.2.
2. Remove two screws securing manifolds to heat exchanger and remove heat exchanger.
Note: Be careful not to allow water to drip onto any electrical components.
3. Using the new seals supplied in the manifolds, re-assemble in reverse order.
Note: Ensure the heat exchanger is fitted the right way up - see label on heat exchanger.
4. Refill and pressurise the system. (Refer to Commissioning, section 5.1).
Fig. 33